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UCC3895: Low Slew Rate for PWM Output

Part Number: UCC3895

I am working on a design with the UCC3895 and have noticed that its output slew rate (rise and fall times) are much slower than expected based on the datasheet.  I am seeing roughly 170ns rise and fall times (80%/20%).  The datasheet specifies typical rise and fall times of 20ns.

Is there anything in my design that I should check regarding this issue?  I've verified my measurement system by using different probes and measuring the corresponding signal for a prior design (different IC), and the measurement system seems to be fine.  I have tried measuring the signals without the isolated gate drivers connected, and observed the same results.  There is no other loading on the circuit that should provide anything more than 10pF of loading.